What is an antigen?

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Question

(B) An antigen is a foreign molecule or substance,such as proteins,polysaccharides,or toxins,that enters the body and is recognized by the immune syst

Vedclass · Accepted Answer

$A$ foreign substance that harms the body and stimulates the production of antibodies.

Vedclass · Answer

(B) An antigen is a foreign molecule or substance,such as proteins,polysaccharides,or toxins,that enters the body and is recognized by the immune system as 'non-self'. Upon recognition,the immune system is stimulated to produce specific proteins called antibodies to neutralize or eliminate the antigen. Therefore,option $B$ is the correct definition.

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